body {
  height: 100%;
  overflow: hidden;
}

#page_gategory {
  display: flex;
  flex-direction: row;
  height: 100%;
}

#detail_main {
  margin: 0 0 0 340px;
  padding: 20px;
  flex: 1;
  min-height: 880px;
  position: relative;
}

#detail_main #detail_con {
  position: relative;
}

#menu_gategory {
  margin: 10px;
  height: 100%;
  width: 330px;
  position: absolute;
  padding-bottom: 10px;
  overflow-y: auto;
}

#menu_gategory_list li {
  line-height: 165%;
  padding: 5px 0;
  display: flex;
}

#menu_gategory_list li span {
  cursor: pointer;
  flex: 1;
  font-size: 12px;
}

#menu_gategory_list li em {
  margin-left: auto;
  padding-right: 10px;
  color: #999;
  font-size: 12px;
}

#menu_gategory_list li .level_0 {
  color: #007fff;
  font-weight: bold;
  font-size: 14px;
}

#menu_gategory_list li .level_1 {
  font-size: 14px;
}

#menu_gategory_list li .level_2 {
  padding-left: 10px;
  color: #666;
}

#menu_gategory_list li .level_3 {
  padding-left: 10px;
}

.book_con {
  display: flex;
}

.book_con .book_img {
  margin-right: 20px;
}

.book_con .book_desc {
  line-height: 175%;
  text-align: justify;
}

.book_button {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  right: 10px;
  bottom: 10px;
}

.book_button .ipt_btn1 {
  margin: 10px;
}

.book_button a {
  color: #007fff;
}

#btn_prev {
  display: none;
}

#page_info {
  display: flex;
  font-size: 12px;
  width: 100%;
  border-bottom: 1px solid #ccc;
  padding-bottom: 15px;
}

#page_info #page_info_tit {
  text-align: left;
  color: brown;
}

#page_info #page_info_num {
  margin-left: auto;
  font-style: italic;
  color: #999;
}
